Method and device for measuring permeability coefficients of stratums at different depths in field

Abstract

A method and device for measuring permeability coefficients at different depths on site, the method comprising the following steps: inserting a connecting pipe into the ground layer to be measured, injecting water into a water injection tank to a designated position, and then injecting water into the water injection tank Apply pressure, calculate and measure the permeability coefficient and the average permeability coefficient of each stage; the device includes a water injection tank at the top, a connecting pipe, a support structure, a pile head, a pressurizing device and a pressure measuring device, and the water injection tank is installed on the top of the support structure , the inner bottom of the water injection tank is equipped with a pressure measuring device for measuring water pressure, and the top of the water injection tank is equipped with a pressurizing device for adjusting the water pressure in the water injection tank; the top water inlet of the connecting pipe is sealed with the inner cavity of the water injection tank In communication, the water outlet at the bottom of the communication pipe passes through the support structure and communicates with the pile head in a sealed manner. The beneficial effects of the invention are: it can fully reflect the real seepage situation of the site, can truly reflect the real situation of the soil body and is easy to operate.

Description

technical field

[0001] The invention relates to a method and a device for measuring permeability coefficients at different depth formations on site. Background technique

[0002] The permeability coefficient is an index that comprehensively reflects the permeability of soil, and the correct determination of its value is of great significance to the calculation of permeability. Its value can be measured in the laboratory, and can also be directly measured at the construction site.

[0003] The measurement methods of permeability coefficient are divided into constant head method and variable head method. The sandy soil has strong water permeability, and the constant head method is generally used. For cohesive soil, due to its poor water permeability, the variable water head method is generally used. Indoor tests need to prepare soil samples, which greatly damages the original structure of the soil, resulting in a large difference between the measured results and the actual ...

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